A Marxist summer camp full of fantastical statues lies tucked away and forgotten in the forests of Moscow.

Scotland's only funicular railway is also the United Kingdom's highest.

Ruined castle with subterranean vaulted Goblin Ha' or "Goblin Hall."

This 16th-century house tells the city's history through old artifacts and quirky tales.

A verdant 17th-century-style garden hidden along Edinburgh’s Royal Mile.

This castle was established by the 4th Duke of Montrose and is connected to the Buchanan Clan.

Islanders once used this dramatic, otherworldly landscape to hide their cattle from Viking raiders.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

A hidden treasure of an abandoned city lies deep in the jungles of Campeche, Mexico.

An abandoned quarry hides an open-air gallery of huge sculptures, some made from the rubble of 9/11.

A cave in southern Italy adorned with thousand-year-old Biblical frescoes existed in obscurity until fairly recently.

Roman ruins top white travertine terraces formed by ancient hot springs.

Come for the oysters, stay for the priceless art honoring inventors across history and Scotland's favorite outdoor sports.

A local tree surgeon has created a whimsical walk full of carved tree stumps near Scotland's Loch Lomond.

Even though some of the buildings date back to the Victorian era, this research institute is still involved in cutting-edge astronomy research.

On the outskirts of Edinburgh, a trio of topiary created by one man over the course of more than 20 years.

Small museum dedicated to the founder of electromagnetic theory.

The healing properties of this well attracted royals and commoners throughout the Middle Ages.

This former train tunnel is filled with lines from a poem crafted by Robert Louis Stevenson.

Enter this small nook and you'll be surrounded by 360 degrees of street art.

The U.K.'s first underground railway line is now a lively thoroughfare for runners and cyclists.

This small museum in a 17th-century building honors three iconic Scottish writers.

Long abandoned underground complex to keep royals safe from a nuclear war that never came.

A secret garden in a picturesque Edinburgh village has inspired artists for centuries.